I only ever use my Xbox gets is TV apps, I was in the same situation. There are rumors going around the Internet that Microsoft are only going to release the Xbox "Lite" next year (ARM based), which is for Arcade games and apps only with the real successor to the 360 coming in 2014. - But as said, only a rumor. (search Google news for "Xbox Lite")

The only reason I haven't parted with my crappy 360 on eBay yet is because of GTA V. Although is a PC release is announce (not likely), my Xbox will be on eBay in an instant.